D20 Service Access Cover - IBM pSeries 7311 D10 Service Manual

D20 Service Access Cover

Before performing the following procedure, read the "Safety Considerations" on page 41.
Opening the Service Access Cover
To open the service access cover, do the following:
1. Open the front rack door and place the Model D20 subsystem into the service position as described in
"D20 Service Position" on page 113.
2. Loosen the three captive thumbscrews located on the rear of the cover. See the following illustration
for thumbscrew locations.
Note: The service access cover pivots on a piano hinge located directly behind the four cooling
blowers.
3. To open the service access cover, lift the cover up from the back edge. The hinges allow the service
access cover to swing open to about 170 degrees. Do not force the cover to come to a rest on top of
the cooling blowers.
Note: When you open the service access cover, ensure you have enough height clearance.
4. Close and then secure the service access cover with the three thumbscrews located on its back edge.
Attention: For proper cooling and airflow, close the cover before turning on the system. Operating the
system for extended periods of time (over 30 minutes) with the cover opened might damage the system
components.
1 Thumbscrews
2 Service Access Cover
Service Access Cover Removal
If you need to remove the service access cover from the subsystem, do the following:
1. Open the cover as described in the previous procedure.
2. Remove the four retaining screws that secure the cover hinge to the chassis.
3. Remove the cover.
Service Access Cover Replacement
To install the service access cover, do the following:
1. Open the hinge, located on the service access cover.
2. Align the four holes located on the hinge with the four screw holes located on the top of the chassis.
3. Start and then tighten the four retaining screws that secure the service access cover to the chassis.
4. Close and then secure the service access cover with the three thumbscrews located on its back edge.
3 Model D20 Subsystem
Chapter 3. Removal and Replacement Procedures
115